Suppress suspicious_else_formatting lint in generated code

[pv42]

Suppress clippy warning about if statements that looks like it should be else if in the generated code (suspicious_else_formatting) like bellow:

warning: this looks like an `else if` but the `else` is missing
 --> /home/user/Documents/folder/rust-mavlink/target/debug/build/mavlink-701ae44e620db1b6/out/all.rs:1:261081
  |
1 | ...mall (need {} bytes, but got {})" , Self :: ENCODED_LEN , __tmp . remaining () ,) } if matches ! (version , MavlinkVersion :: V2) { let len = __tmp . len () ; :: mavli...
  |                                                                                       ^
  |
  = note: to remove this lint, add the missing `else` or add a new line before the second `if`
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_else_formatting

Note that the warning only appears when used without the format-generated-code feature.